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The daily life of people in the intelligent age is inseparable from electronic device, and a number of bacteria on touch screens are increasingly threatening the health of users. Herein, a photocatalytic TiO 2 /Ag thin film was synthesized on a glass by atomic layer deposition and subsequent in situ reduction. Ultraviolet-visible (UV-Vis) spectra showed that this film can harvest the simulated solar light more efficiently than that of pristine TiO 2 . The antibacterial tests in vitro showed that the antibacterial efficiency of the TiO 2 /Ag film against S. aureus and E. coli was 98.2% and 98.6%, under visible light irradiation for 5 min. The underlying mechanism was that the in-situ reduction of Ag on the surface of TiO 2 reduced the bandgap of TiO 2 from 3.44 to 2.61 eV due to the formation of Schottky heterojunction at the interface between TiO 2 and Ag. Thus, TiO 2 /Ag can generate more reactive oxygen species for bacterial inactivation on the surface of electronic screens. More importantly, the TiO 2 /Ag film had great biocompatibility with/without light irradiation. The platform not only provides a more convenient choice for the traditional antibacterial mode but also has limitless possibilities for application in the field of billions of touch screens.

ALD-induced TiO2/Ag nanofilm for rapid surface photodynamic ion sterilization